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(11) | EP 0 298 418 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Virtual computer system |
| (57) In the conventional virtual computer system, in order to provide the same access
method for the host and the guest, there exists a great overhead for the operations
to save and to restore the host resource at a change-over between the host and the
guest. In the disclosed system, the same access method is provided for the host and
the guest and at the same time the overhead is removed. The host resource (11) and
the guest resource (12) are separately allocated. There is disposed a mode line (5)
indicating whether the present state is associated with the host or the guest. There
is also disposed an access controller (2, 3) which operates such that when the mode
line indicates the host, the host resource is accessed, and when the guest is indicated,
the guest resource is accessed. |